适用于推扫式成像光谱仪的CCD拖尾扣除方法

拖尾(smear)现象是面阵CCD器件的固有问题。在推扫式成像光谱仪中，拖尾对成像的作用形式较为特殊，传统的扣除方案已不再适用，急需新的适合这一应用场合的方法。通过建立光谱仪中拖尾现象的数学模型，分析并仿真了常规拖尾扣除方法的失真问题，提出了适合推扫式光谱仪器的新方法。新方法使用已知图像信息估计景物的光谱分布，以此计算光学暗行通道所代表的拖尾信号在每个应用通道中的贡献，进而实现拖尾现象的扣除。遥感图像处理结果的较为理想的LSF表明，新方法效果良好，适用于推扫式成像光谱仪中CCD拖尾现象的扣除。

A Method for Smear Removal of Push-Broom Imaging Spectrometers

Smear is an inherent problem of area CCD and there have been many researches on how to deduct it. However, the imaging model of push-broom imaging spectrometer is very special, in which the usual methods are no longer applicable. To develop a new method that is suitable for the application of imaging spectrometer, a more detailed model was built. The problem of distortion of usual method was also analyzed and simulated. The original image of each channel was used to estimate the spectral distribution of the target, by which the contribution of smear of the black optical channel to each channel is quantified. Both simulation and restoration result of the remote sensing image showed that the new method worked well for the CCD smear deduction of push-broom imaging spectrometer.